Hydraulic elevator



(No Model.)

. A. J. McADAM. HYDRAULIC ELEVATOR.

No. 469585. Patented Feb. 23, 1892. I

UNITED STATES PATENT OFFICE.

ALEXANDER J. MOADAM, OF SAN FRANCISCO, CALIFORNIA.

HYDRAULIC ELEVATOR.

SPECIFICATION forming part of Letters Patent 1 \To. 469,585, datedFebruary 28, 1892. Application filed November 9, 1891. Serial No.411,404. (No model.)

To aZZ whom it may concern:

Be it known that I, ALEXANDER J. McADAM, a citizen of the United States,residing in the city and county of San Francisco, State of California,have invented an Improvement in Hydraulic Elevators; and I herebydeclare the following to be a full, clear, and exact description of thesame.

My invention relates to ,that class of hydraulic elevators in which thepressure of the water is directed upon oppositely-moving parts, whichare connected together, whereby they move in unison, and are alsoconnected with the cage or car to effect its travel.

My invention consists in telescopic cylinders moving in oppositedirections, said cylinders having sheaves over which the hoisting-ropespass.

It also consists, in connection with said cylinders, of the telescopicor extensible waterpipes by which water under pressure is supplied tothe cylinders and exhausted therefrom; and it finally consists in thecombination of said cylinders and the connectingchains by which they areenabled to move in unison.

The object of my invention is to provide a simple and effectivehydraulic elevator.

Referring to the accompanying drawings for a more complete explanationof my invention, Figure 1 is a plan of my elevator mechanism. Fig. 2 isa side elevation of same.

Though my invention is applicable to both horizontally and verticallyarranged cylinders, I have here shown the horizontal arrangement.

A is the stationary frame-work of the ap paratus.

B is the outside or larger cylinder, and O is the inner or smallercylinder. The cylinder 0 moves within the cylinder B, and the two areunited by a suitable joint, stuffing-box, and connection,as is shown atD, This connection D has joined to its ends the carrying.

wheels d, which move and travelupon the side rails of the frame-work A.There are four of these wheels d, two bearing under and two bearing overthe side rails A. The end of cylinder B has a cap or head I), which isprovided at its ends with carrying-wheels b, there being four of these,two being under and two above the side rails A. The cylinder 0 carries ahead or cap 0, the ends of which are provided with carrying-wheels 0,four in number, two being under and two above the side rails A. The heador cap cis hollow and communicates with the cylinder 0. The head or capI) carries a frame E, in which are the sheaves e. A corresponding frameF is carried by the head or cap 0, and said frame has the sheaves f.

G indicates the main operating-valve, from which the pipe g extends,said pipe being connected with a pipe H, located opposite the cylinderB. Into this pipe H telescopes the pipe Il',the end of said pipe beingconnect-ed with the hollow head or cap a of cylinder 0.

I is one of the hoisting-ropes. Thisis connected at one end suitablywith the head or cap 12 of cylinder B. It thence passes back and forthbetween the sheaves f and e, and extends upwardly, and its other end isto be connected suitably with the cage or car. In its course it alsopasses around end sheaves M and J.

I is another hoisting-rope, the end of which is connected with the heador cap 0 'of cylinder C, and passes back and forth over the sheaves candf and under the fixed sheave J at one end of the frame A, and thenceconnected at its other end to the cage or car.

K and K are the connecting chains, ropes, or cables by which thecylinders 13 and Care caused to operate in unison. One pair K of thesechains is secured at one end to the head or cap 0, and thence passesaround the fixed end pulleys L, and is connected at the other end to thehead or cap I). The second pair K is connected with. the head or cap I)and thence passes around end pulleys L and back again to the head or cap0, to which they are connected. These chains thus connected arepractically endless ones, and theycause the cylinders to move in unison.

The telescopic cylinders are simple and practical in construction,avoiding the large amount of packing and number of stuflingboxesnecessary where pistons are used.

The operation is as follows: Water is admitted through pipes G g H and Hto cylinder 0 and effects the opposite movement of the two cylinders. Asthey withdraw from each other the hoisting-ropes are spread and the cageor car is elevated. As the water is ex- ICO I claim as new, and desireto secure by Letters Patent, is

1. In a hydraulic elevator, the combination of telescopic cylinders, aWater connection thereto, whereby they are moved in opposite directions,sheaves carried by each of said cylinders, and hoisting-ropes passingback and forth between said sheaves and connected with the cage or car,substantially as herein described.

2. In a hydraulic elevator, the combination of telescopic cylinders, aWater connection thereto, whereby they are moved in opposite directions,sheaves carried by each of said cylinders, hoisting-ropes passing backand forth between said sheaves and connected with the cage or car, andendless chains, ropes, or cables connecting said cylinders, whereby theymove in unison, substantially as herein described.

3. In a hydraulic elevator, the combination of oppositely-movingtelescopic cylinders, sheaves carried by each of said cylinders,

hoisting-ropes passing between said sheaves.

5. In a hydraulic elevator, the combination of the oppositely-movingtelescopic-cylinders having end heads or caps, sheaves carried by eachof said cylinders, hoisting-ropes carried by and between the sheaves,the fixed waterpipe H, and the water-pipe H, telescoping in said pipe Hand communicating through the head or cap of one of said cylinders withsaid cylinders, substantially as herein described.

6. In a hydraulic elevator, the combination of the oppositely-movingtelescopic cylinders having end heads or caps, sheaves carried by eachof said cylinders, hoisting-ropes carried by and between the sheaves,the fixed waterpipe H, and the Water-pipe l-I, telescoping in pipe [Iand communicating through the head or cap of one of said cylinders withsaid cylinders, and endless chains, ropes, or cables connecting thecylinders for causing them to move in unison, substantially as hereindescribed.

7. In a hydraulic elevator, the combination of the oppositely-movingtelescopic cylinders B 0, having the end heads or caps b and c, and thecarrying-wheels of said cylinders travelin g on a fixed frame, thesheaves of said heads or caps, the hoisting-ropes carried by thesheaves, and the extensible water-pipes II and H, communicating throughcap 0 with the end of cylinder 0, substantially as herein described.

8. In a hydraulic elevator, the combination of the oppositely-movingtelescopic cylinders B 0, having the end heads or caps 12 and c, and thecarrying-wheels of said cylinders traveling on a fixed frame, thesheaves of said heads or caps, the hoisting-ropes carried by thesheaves, the extensible water-pipes H and H, communicating through cap 0with the end of cylinder 0, the end pulleys L L, and the chains, ropes,or cables connected with the end heads of thecylinders and passingaround said pulleys, substantially as herein described.

In witness whereof I have hereunto set my hand. 4

ALEXANDER J. llIoADAM.

Witnesses:

S. H. NOURSE, H. F. Ascrrnox.

